You should be able to accomplish that with the following:
<cffeed source="
http://codemadnessblog.blogspot.com/"
properties="theFeed" query="rsFeed" />
The cffeed tag will return a query object which you can use
to output the feed data:
<cfif rsFeed.RecordCount GTE 1>
<cfoutput>
<h3>#theFeed.title# RSS Feed</h3>
</cfoutput>
<p>
<cfoutput query="rsFeed" maxrows="5">
<cfif theFeed.version IS "atom_1.0">
<a href="#linkhref#">#title#</a>
<cfelse>
<a href="#rsslink#">#title#</a>
</cfif>
<p>#content#</p>
</cfoutput>
<cfelse>
<h3>No RSS Feed Currently Available</h3>
</cfif>
Hope that helps get you going!